My kid recently figured out that a good way to get daddy's attention !NOW! is to simply press and hold the power button of my computer and , hey presto! daddy has lots of time on his hands a few seconds later.

This is a little sth. that allows me to protect the power button from unauthorized use by someone with insufficiently developed (rapidly developing) fine-motor skills and avoid further unforseen interruptions (for the time being).

glue the ring to your computer case & use a 3mm peg to attach the center.
For the peg you can use a simple 3mm piece of PLA

print in PLA, .1mm layers, slicing & printing in CURA